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a) 5 km/hr
b) 3 km/hr
c) 6 km/hr
d) 8 km/hr
correct answer is: b) 3 km/hr
Explanation
We know,
Speed = \frac{Distance}{Time}
And converting “m/sec” to “km/hr” requires multiplying by \left(\frac{3600}{1000}\right)\ or \ \left(\frac{18}{5}\right) . Here “3600 seconds = 1 hour & 1000 metre = 1 kilometre”.
So, speed = \left(\frac{5}{6}\ \times\ \frac{18}{5}\right) km/hr
\rightarrow\ 3\ km/hr
Ans: Speed = 3 km/hr.
